import { deepMerge, isUndefined } from '../../utils'
import type {Config} from '../types'
/**
 * 合并局部配置优先的配置，如果局部有该配置项则用局部，如果全局有该配置项则用全局
 * @param {Array} keys - 配置项
 * @param {Object} globalsConfig - 当前的全局配置
 * @param {Object} config2 - 局部配置
 * @return {{}}
 */
const mergeKeys = <T>(keys: Array<string>, globalsConfig: Config, config2: Config): T => {
	const config: Config = {}
	keys.forEach((prop) => {
		if (!isUndefined(config2[prop])) {
			config[prop] = config2[prop]
		} else if (!isUndefined(globalsConfig[prop])) {
			config[prop] = globalsConfig[prop]
		}
	})
	return config as T
}
/**
 *
 * @param globalsConfig - 当前实例的全局配置
 * @param config2 - 当前的局部配置
 * @return - 合并后的配置
 */
export default <T>(globalsConfig: Config, config2: Config = {}): T => {
	const method = config2.method || globalsConfig.method || 'GET'
	let config: Config = {
		baseURL: config2.baseURL||globalsConfig.baseURL ||'',
		withCredentials: config2.withCredentials||globalsConfig.withCredentials ||false,
		method,
		url: config2.url || '',
		params: config2.params || {},
		custom: { ...(globalsConfig.custom || {}), ...(config2.custom || {}) },
		header: deepMerge(globalsConfig.header || {}, config2.header || {})
	}
	const defaultToConfig2Keys = ['getTask', 'validateStatus']
	config = { ...config, ...mergeKeys(defaultToConfig2Keys, globalsConfig, config2) }

	// eslint-disable-next-line no-empty
	if (method === 'DOWNLOAD') {
		// #ifdef H5 || APP-PLUS
		if (!isUndefined(config2.timeout)) {
			config.timeout = config2.timeout
		} else if (!isUndefined(globalsConfig.timeout)) {
			config.timeout = globalsConfig.timeout
		}
		// #endif
	} else if (method === 'UPLOAD') {
		delete config.header['content-type']
		delete config.header['Content-Type']
		const uploadKeys = [
			// #ifdef APP-PLUS || H5
			'files',
			// #endif
			// #ifdef MP-ALIPAY
			'fileType',
			// #endif
			// #ifdef H5
			'file',
			// #endif
			'filePath',
			'name',
			// #ifdef H5 || APP-PLUS
			'timeout',
			// #endif
			'formData'
		]
		uploadKeys.forEach((prop:string) => {
			if (!isUndefined(config2[prop])) {
				config[prop] = config2[prop]
			}
		})
		// #ifdef H5 || APP-PLUS
		if (isUndefined(config.timeout) && !isUndefined(globalsConfig.timeout)) {
			config.timeout = globalsConfig.timeout
		}
		// #endif
	} else {
		const defaultsKeys = [
			'data',
			// #ifdef H5 || APP-PLUS || MP-ALIPAY || MP-WEIXIN
			'timeout',
			// #endif
			'dataType',
			// #ifndef MP-ALIPAY
			'responseType',
			// #endif
			// #ifdef APP-PLUS
			'sslVerify',
			// #endif
			// #ifdef H5
			'withCredentials',
			// #endif
			// #ifdef APP-PLUS
			'firstIpv4'
			// #endif
		]
		config = { ...config, ...mergeKeys(defaultsKeys, globalsConfig, config2) }
	}

	return config as T
}
